Exercise: Transformers

Questions for: Transformers

What is the coefficient of coupling for a transformer in which 4% of the total flux generated in the primary does not pass through the secondary?
A:
0.4
B:
4
C:
9.6
D:
0.96
Answer: D
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When a 6 V battery is connected across the primary of a transformer with a turns ratio of 8, the secondary voltage is
A:
0 V
B:
6 V
C:
48 V
D:
0.75 V
Answer: A
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In a certain transformer, the input power to the primary is 120 W. If 8.5 W are lost to the winding resistance, what is the output power to the load, neglecting any other issues?
A:
0 W
B:
14.1 W
C:
111.5 W
D:
1,020 W
Answer: C
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When a 200 load resistor is connected across the secondary winding of a transformer with a turns ratio of 4, the source "sees" a reflective load of
A:
50
B:
12.5
C:
800
D:
0
Answer: B
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To step 120 V ac up to 900 V ac, the turns ratio must be
A:
75
B:
750
C:
7.5
D:
0.13
Answer: C
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